So sparingly is 1 time a year and 3 or 4 games every 10 years?....so 14 times a decade?
No. I used the word "like". "Special events
like" which makes the sports event inclusive, not exclusive.
St. Patricks? Perhaps.
Valentines? Sure.
Queen's visit? Heck, why not.
The grand opening of that new sushi restaurant 40 kilometers away? Nah!
I'll leave it to a good designer to decide.
I never defined how sparingly. Could be too few like 1 a year or too many like 364 times a year, I'd leave it to a good designer (hope they consult one) to come up with something optimal. Ideally, it would be nice to not run a circus show every single time -- just a nice relaxing warm soft glow (maybe run the LED in two tone mode by default -- incandescent yellow combined with orangeish-yellow 'accents' is an example -- but the lighting designers can come up with relaxing themes to calm hurried commuters a smidgen) after a stressful commuter day and keep safety high. Animations can be distracting on overcrowded platforms which is precisely why I'm not sure animations during peak are a good idea, people looking up while the colors animate wildly 24/7.
When a changed static light color theme and/or lightshows (if any) happen, it will be far more thrilling. Canada's day could be all red with white-colored "scone uplight style" (from inside) accents superimposing a mostly uniform red-box glow, as one of many possible example two-tone patterning from simple RGB spot lamps. Then leafs playoffs games could run a blue-white animation, as one possible theoretic example, by fading the various RGB spots in sequence in a blue-white fade-wave animation. Default theme would be a nice relaxing incandescent-colored warm glow (with or without a subdued second color such as orange) designed to calm commuters, and always used at peak period. Or who knows, maybe they want to do a lightshow every weekend as a tourist draw. The best LED accent lighting designers and crowd-calming lighting techniques can do a great job with this, to rollout RGB lighting without being circusy to stressed commuters mid-peak everyday.
Not everyone wants a flashing psychedelic distraction at 5:15pm ET...
Anyway, it's probably a single static color, but if they install RGB color lighting, it needs to be used artfully rather than willy-nilly circus 24/7 of flashing red-green-blue cacophony in the midst of that station. I've seen people install RGB accent lighting and "artfully light them" far more pleasingly than far-more-expensive installations, by designing and running a skilled color theme.
Just because the "tool" is there (color changeability) not everyone can paint a Monet or Rembrandt when given a paintbrush. And it's Union after all.